Gu Chen, the former top agent "Ghost Valley", retired from Jiangcheng due to the failure of his mission and became an ancient book restorer. He just wanted peace. But a mysterious ancient book drew him into the center of the whirlpool with his quiet neighbor, professor Lin Wanqing. The gangsters of the chaebol, old colleagues, mysterious intelligence dealers... All dangers followed. When the peace was torn apart, the former ace quietly returned to his position. Using the country as a chessboard and people's hearts as pawns, a silent power game begins quietly in the depths of the city.
